<script type="text/javascript">
            $(function(){
                var getID = "{$_GET['tag']}";
                $('.admin_ui_menu li').each(function(){
                    $(this).removeClass('this');
                });
                $('li[rel="'+getID+'"]').addClass('this');
                $('li:first').css({
                    'border-left' : '1px solid #333'
                });
            });
        </script>